Some documents I can't get the height of the document (to position something absolutely at the very bottom). Additionally, a padding-bottom on seems to do nothing on these pages, but do on the pages where height will return. Case(s) in point:

http://fandango.com
http://paperbackswap.com

On Fandango
jQuery's $(document).height(); returns correct value
document.height returns 0
document.body.scrollHeight returns 0

On Paperback Swap:
jQuery's $(document).height(); TypeError: $(document) is null
document.height returns an incorrect value
document.body.scrollHeight returns an incorrect value

Note: I have browser level permissions, if there is some trick there.